Soo I may have mashed a number of postings together and drawn a wrong conclusion, for example in https://discourse.threejs.org/t/solved-glb-model-is-very-dark/6258 you recommend the following, I have also seen other references to use these light types… I seem to recall other postings implying only use directional/hemisphere lighting. Also I guess I need to test metalness also.
Remove your previous light setup and try it with this:
var hemiLight = new THREE.HemisphereLight( 0xffffff, 0x444444 );
hemiLight.position.set( 0, 300, 0 );
scene.add( hemiLight );
var dirLight = new THREE.DirectionalLight( 0xffffff );
dirLight.position.set( 75, 300, -75 );
scene.add( dirLight );